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Full-fiber crankshaft upsetting and extruding forming method

A full-fiber, crankshaft technology, applied to engine components, mechanical equipment, metal processing equipment, etc., can solve the problems of difficulty in exerting the advantages of full-fiber crankshaft fatigue performance, poor streamline shape, and poor streamline shape distribution, etc., to achieve Improved fatigue performance, full filling, and reasonable distribution of streamlines

Inactive Publication Date: 2019-05-10
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the attached figure 1 When the step axis shown is formed on the traditional full-fiber forming (the deformation direction is shown in Figure 3), the horizontal upsetting and vertical deflection speeds depend on each other and cannot be independent. In this case, the existing problems are: One is that it leads to poor streamline shape
In this way, it is inevitable to increase the volume of the stepped shaft blank in order to obtain a single crank with full filling. Second, the streamline shape distribution is poor, and it is difficult to take advantage of the fatigue performance of the full-fiber crankshaft.

Method used

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  • Full-fiber crankshaft upsetting and extruding forming method
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  • Full-fiber crankshaft upsetting and extruding forming method

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Embodiment 1

[0023] The present invention designs a new shape structure of the stepped shaft blank. The connecting surface of the connecting rod neck area blank and the crank arm area blank of the blank is changed from a vertical surface to an inclined surface, and the inclined surface is biased to the blank side of the crank arm deformation area of ​​the blank and is aligned with the blank. The angle at the center is 15 to 45°.

[0024] The volume ratio of the blank deformation zone to the single throw of the crankshaft is controlled within the range of 1.04 to 1.09. The diameter and length of the blank in the connecting rod neck area / main journal area of ​​the stepped shaft are the same as those of the forging, and the blank length in the deformation zone of the crank arm is the original vertical design. 1.15 to 1.35 times of that.

[0025] The horizontal and vertical displacements of the upsetting extrusion forming device can be loaded independently, and the horizontal and vertical disp...

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Abstract

The invention discloses a full-fiber crankshaft upsetting and extruding forming method. According to the full-fiber crankshaft upsetting and extruding forming method, a special blank structure, the speed relation between a horizontal upsetting and a vertical misalignment are adopted, and the streamline distribution and the filling effect of the crankshaft forging can be improved. The full-fiber crankshaft upsetting and extruding forming method is used for forming the crankshaft, and a high-quality crankshaft forge piece with filling type and reasonable distribution of streamline morphology canbe obtained under the lower blank and the volume ratio of the forge piece.

Description

technical field [0001] The invention belongs to the field of precision plastic forming technology and equipment, and specifically relates to an upsetting and extrusion forming process for a full-fiber crankshaft forging, which can be used in various upsetting-extrusion composite forming (or called full-fiber forming) devices. Background technique [0002] Existing diesel engines greatly increase the power density per liter while reducing the size of its main components. The crankshaft is the most important component of the engine, and its fatigue performance directly affects the reliability of the engine. The fatigue strength of crankshafts prepared by traditional free forging and other processes does not match the needs of high power density engines. Crankshafts prepared by upsetting extrusion composite forming (also known as full-fiber forming) can greatly improve their fatigue resistance, and are the preferred forming process for high-performance crankshafts [1]. Cranks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/08B21J5/08
Inventor 林军陈文陈强康凤黄树海王艳彬胡传凯夏祥生赵祖德
Owner NO 59 RES INST OF CHINA ORDNANCE IND